Variance has got to be one of the least intuitive aspects of most type systems.

Keep an eye on where the server is located, and where in the world you and your friends are. Network latency is important for games like Minecraft.

There's a whole section on this in The Little Book of Rust Macros. Your solution will form an AST that's inefficient to process. lukaswirth.dev/tlborm/decl-...

Glad to hear it. The offer still stands to dive into the traces!

I'm happy to dive into traces with you over DMs. Often there's some minor things that can be tweaked to improve performance.
nextjs.org/docs/app/api...

No, we've discussed it, but:
- We think the filesystem cache is a better all-around solution.
- If you have a large app, which routes should we compile?
- We're keeping an eye on memory usage, and with our current architecture, this would likely waste more memory than most users would want.

The filesystem cache is available in beta on Next 16.0, and we're hoping to ship it as stable and on-by-default very soon (we've been working on it for over a year!). nextjs.org/blog/next-16...

Regarding compilation upon navigation: It should be better in Next 16, but we are working on a couple things to address this:
- A file-system cache that persists across restarts of `next dev`.
- An alternate bundling mode that shares more work across pages, at the cost of a slower first page load.

@runofthemillgeek.com Happy to help dig in, especially with traces, if that document doesn't solve it for you. My DMs are open.

Local microfrontends support is a big deal!

You can try it out both of these features today in the latest Next.js canary:
npm install next@canary

If you run into any issues, let me know so we can fix it before Next.js 16 goes out!

In addition to this automatic configuration of Babel, we added a new 'condition' field for controlling when manually-configured webpack loaders run in Turbopack.

It builds on top of internal functionality that we didn't cleanly expose until now.

Fortunately, the breaking changes planned for 16 should be pretty minor for most people.

Did you try the codemods that Next 15 shipped with?